Posted by **Ashley** on Tuesday, January 29, 2013 at 8:20am.

The power P delivered to a load by a current of i amperes through a resistance of 19 ohms, when 110 volts are supplied at one end of the line, is given by the formula P = 110i - 19i2 . Determine the maximum power that can be delivered.

maximum power in watts =

My Answer:

My answer is:

P=110i-19i^2

P'=110-38i

0=110-38i

i=2.8947

P"=-38 therefore a max

Max Power in watts = 2.8947

can you please confirm this is correct. Thanks

- Math Max min problems -
**Steve**, Tuesday, January 29, 2013 at 10:32am
no, maximum power is P(2.8947) = 159.211

- Math Max min problems -
**Ashley**, Tuesday, January 29, 2013 at 10:47am
ok. I understand that you took the value and plugged in for i. But can I ask why...

- Math Max min problems -
**Steve**, Tuesday, January 29, 2013 at 11:00am
because they asked for maximum power, not the current which produces maximum power. Just because you arrive at an answer, that does not mean you have answered the question.

- Math Max min problems -
**Ashley**, Tuesday, January 29, 2013 at 11:46am
Ok.... great. thank you Steve. I know understand!

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